Roller drive for roller mills



Feb. 5, 1946. E. ROTH ROLLER DRIVE FOR ROLLER MILLS Filed Dec. 8, 1945Patented Feb. 5, 1 946 ROLLER DRIVE FOR ROLLER MILLS Ernst Roth,Niederuzwil, Switzerland, assignor to Gebruder Buhler, Uzwil,Switzerland Application December 8, 1943, Serial No. 513,440 InSwitzerland August 11, 1942 2 Claims.

The present invention relates to a roller drive for roller mills inwhich a gear wheel mounted on the axis of the stationary roller mesheswith a gear wheel associated with the adjustable roller, this lattergear wheel being mounted on a stationary hollow journal pin and coupledwith the adjustable roller. Such an arrangement of a roller driveprovides that upon a movement of the adjustable grinding roller theengagement of the gear wheels does not vary. In known drives of thistype the coupling of the gear wheel mounted on the stationary hollow pinwith the adjustabl roller is efiected by means of a pin fixedeccentrically in one of the parts to be coupled and engaging alongitudinal slot of the other part, whereby the adjustable roller canbe displaced while conserving the correct mesh of the two gears.However, the eccentric pin does not exert a pure torque on the movableroller, but a variable pressure, so that the grinding pressure on theside of the drive of the roller is not equal to that on the oppositeside of the roller. Accordingly, it is not possible to obtain a uniformgrinding effect with the mentioned known arrangements.

This inconvenience is avoided by the roller drive for roller millsaccording to the present invention in that the coupling of the gearwheel associated with the adjustable roller axis with the adjustableroller is so formed that a pure torque is exerted on the adjustableroller, so that upon a uniform feed motion being imparted to theadjustable roller, the grinding pressures on the driving side of theroller and on the opposite side remain equal. Conveniently a positivelever system connected with the gear wheel mounted on the hollow journalpin attacks on two diametrically opposed points of a driver fixed on theaxis of the movable roller.

The accompanyin drawing represents by way of example an embodiment ofthe present invention.

Fig. 1 is a sectiona1 View of the drive of the movable roller;

Fig. 2 shows a front view of the device with a sectioned wheel casingand dismantled driver;

Fig. 3 is a section according to the line IIIIII of Fig. 2, and

Fig. 4 shows a fragmentary view of Fig. 2.

The axis I of one roller 19 is mounted in a stationary bearing 2 and theaxis 3 of the other roller 20 in a movable bearing 4. The gear wheel 5placed on the fixed roller axis l cooperates with the gear wheel 6 whichserves for the drive of the adjustable roller 20.

The gear casing 1 is rigidly connected with the stationary bearing 2 onthe one hand and with the machine standard 8 on the other hand andcarries a hollow journal pin 9 surrounding the adjustable roller axis 3,the bore of which is greater than the diameter of the roller axis 3 toallow for the release stroke of th roller and to take up wear of therollers.

The gear wheel 6 is ro-tatably mounted on the stationary hollow journalpin 9 and carries at two diametrically opposed points two bolts ID towhich are attached with one of their ends links H; the other end of eachlink H being hingedly connected to one fork-shaped end of a smalldoublearmed lever l3. The journals M of th two levers I3 are carried byarms of a driver 16 the hub of which is rigidly connected by a key Hi tothe roller axis 3. The other fork-shaped ends of the levers [3 areconnected by means of bolts IT with a ring l8. In this manner a positivemovable coupling is formed between the gear wheel 6 and the roller axis3, and any modification of the distance between the axes of thestationary and the adjustable rollers is without effect on the mesh ofthe gears. Further, only a single pair of forces acts upon the rolleraxis 3, which accordingly is subjected to a pure torque, but to no gearpressure, so that upon any uniform adjustment of the movable roller thegrinding pressures on the driving side of the roller and on the opposedside remain equal.

I claim:

1. In a roller drive for roller mills having cooperating stationary andadjustable rollers mounted on rotatable axes, a gear wheel mounted onthe axis of the stationary rollers, a stationary hollow journal pintraversed by the axis of the adjustable roller, a gear wheel looselymounted on said journal pin and meshing with said first mentioned gearwheel, a driver mounted for rotation with the axis of the adjustableroller, a ring loosely surrounding the axis of the journal pin, leverspivoted intermediately of their "ends to opposite points on the driver,one end of each of said levers being pivoted to said ring, and linksconnecting the gear wheel on said journal pin with two diametricallyopposed points of said driver so as to exert a pure driving torque onthe driver.

2. In a roller drive for roller mills having cooperating stationary andadjustable rollers mounted on rotatable axes; a gear wheel mounted onthe axis of the stationary roller, a stationary hollow journal pintraversed by the axis of the adjustable roller, a gear wheel looselymounted mounted for rotation with the axis of the stationary roller, twojournal pins carried by said driver on diametrically opposed pointsthereof,

a double armed lever mounted on each of said two journal pins, two linkrods each having one' end hingedly' connected to the gear wheel mount--ed on said hollow stationary journal pin and the other end to oneend ofeach of said double armed 'levers, and a member ,movable relatively tothe gear and journal for positively connecting with each other theotherends of said two double' 1 armed levers. V

ERNST ROTH.

